Mill



F. C. BIGGERT. JR

MILL

Filed June 10, 1922 5 Sheets-Sheet l I in' m??? @M M mm, M, 1924.1,519,657 F. c. BIGGERT, JR

MILL

Filed June 10,1922 I 5 Sheets-Sheet 2' I CJ-IINYENTOIZZ 1/ "7 F.Q'BIGGERT. JR

MILL

Filed June 10 1922 3 Sheets-Sheet 5 INVENTOR Patented Dec. 16, 1924.

UNITED .s'rss AENT FFlCE.

FLORENCE C. BIGGERT, JR., 0F GRAFTON, PENNSYLVANIA, ASSIGNOR .TO UNITEDENGINEERING AND FOUNDRY COMPANY, OF PITTSBURGH, PENNSYLVANIA, A

C'OBPOBATION OF PENNSYLVANIA.

MILL.

Application filed June 10, 1922. Serial No. 567,281.

To all whom it may concern:

Be it known that I, FLORENCE C. BIGGERT, Jr., a citizen of the UnitedStates, residing at Grafton, in the county of Allegheny and State ofPennsylvan a, have invented a new and useful Improvement in Mills, ofwhich the following is a full, clear, and exact description.

My invention relates to mills and is applicable to any kind of millhaving smooth rolls and to mills having certain forms of shaping rolls.

' My invention relates particularly to a method of and means forhydraulically supporting, cooling, lubricating and reinforcing the rollsof mills, and will be better understood by reading the followingdescription taken in connection with the accompanying drawingsillustrating one embodiment of my invention, and in which:

Figure 1 is a front elevation of a part of a mill embodying myinvention;

Figure 2 is a section on line 11-11 of Figure 1;

Figure 3 is a top plan view of the cylinder and piston;

' Figure 4 is a bottom plan view of the piston, and

Figure 5 is a partial side elevation of the mill shownin Figures 1 and2.

Referring to the drawings, the mill comprises the usual housings 1 and 2for the rolls and carries the bearings 3, 4, 5 and 6 in which the rollsare mounted. The bearings 4 and 5 are held in place by the screws 7 and8, respectively. The parts so far described may be of any well known ordesired construction. Mounted between and carried by the housings 1 and2 are two cylinders 9 and 10. These cylinders are provided with pistons11 and 12, respectively. The piston 11 engages the roll 13 and thepiston 12 engages the roll 14. The

istons 11 and 12 are rovided with cham- Eers 15 and 16, respectlvely,which communicate through the passages 17 and 18 with the interiorportions 19 and 20 of the cylinders 9 and 10. Any suitable packingmaterial 21 may be placed around the pistons 11 and 12. The lowerportions of the pistons are shaped to closely fit the surface of therolls as shown in Figure 2 so that each of the chambers 15 and 16 hasone side constituted by the rolls 13 and 14, respectively. The pipes 22and 23 communicate with fluid under pressure and conduct the same intothe chambers 19 and 20 and from these chambers into the chambers 15 and16 through the passages 17 and 18. The areas of the pistons 11 and 12which are subjected to the pressures in the chambers 19 and 20 arelarger than the areas of the chambers 15 and 16. These areas are sodesigned relative to each other that sufficient pressure will be createdbetween the edges 24 and 25 of the piston 11 and the edges 26 and 27 ofthe piston 12 and the rolls 13 and 14, respectively, to form a fairlytght joint so that suflicient pressure may be produced upon the fluid inthe chambers 15 and 16 to reinforce the rolls substantially throughouttheir length. The pressure created in the chambers 15 and 16 directlyupon the rolls 13 and 14: also act to relieve the necks of the rolls ofconsiderable pressure. The contact of the fluid in these chambers withthe rolls and the escape of a' relatively small amount of fluid betweenthe rolls and the edges of the chambers act to effectively cool therolls and to reduce the metallic friction between the rolls and theedges of the chambers or pistons by creating a sheet of fluid betweenthe rolls and the edges of the pistons.

In mills of this character the lower rolls are usually fixed and springsor similar means are used to maintain the rolls separated when no workis in the mill.- In my mill the lower roll is fixed and supported by itsbearings. Means are provided for adjusting the upper roll to accommodatematerials of different thicknesses. These means comprise screws 7 and 8and wedges 28 and 29 which wedges may be moved in either direction bybolts 30 and 31. The wedges act to raise the upper roll against thepoints of the screws 7 and 8 when said screws have been adjusted toaccommodate the thickness of the material being rolled Two wedges areprovided for each end of the rolls.

The wedges act to hold the upper roll substantially against the pointsof the screws 7 and 8 when no work is in the mill. This or similar meansis particularly efficacious in my device wherein the u per roll isreinforced and supported by t e means heretofore described.

By reason of the floating nature of the pistons 11 and 12 the adjustmentof the upper roll does not in any way adversely affeet the fluid actionon the rolls.

When there is no work in the mill the pressure may be .cut ofl from thecylinders 9 and 10. If it is not cut off the wedges Y28 and 29 will actto maintain the rolls in from cylinder 9 the positions of the rollsrelative to each other would not be changed. From the foregoing it willbe seen that means are provided for positively holding the rolls fixedrelative to each other.

My invention has many advantages,

among which may be mentioned that rollsof l and the rolls; by properlyproportioning the relation of the areas of the pistons the requiredamount of pressure may be created between the edges of the pistons andthe rolls to effectively seal the chambers in which the reinforcing andcooling fluid is confined.

Many other advantages will be apparent to those skilled in the art andneed not be recited .here.

While I have shown and described one embodiment of my invention, Idesire it to be understood that I am not limited to theexact-arrangement shown and described, as many changes may be made inthe details thereof without departing from the spirit of my invention.

I claim:

1. In a mill, the combination of a pair of coacting rolls, and adifferential area piston having a common pressure supply for both endsof the, piston for maintaining fluid pressure on one side of one of saidrolls.

2. In a mill, the combination of a pair of coacting rolls, and adiflerential area-piston having a common pressure supply for both ends.of the piston for maintainin fluid pressure alon one side of one of saidrolls and substantially throughout the length thereof.

3. In a mill, the combination of a pair of coacting rolls, means forpositively spacin said rolls, means for reinforcing one of sai rollscomprising a member engaging the roll and having a fluid chamberadjacent the roll, and means for supplying fluid under pressure to saidchamber.

4. In a mill, the combination of a pair of coacting rolls, means forpositively spacin said rolls, a piston engaging one of rolls and a fluidchamber in said piston, one

side of said chamber being constituted by one of said rolls.

5. In a mill, the combination of a pair of coacting rolls, a pistonengaging one of said rolls and a fluid chamber in said piston therebeing a communicating passage from end to end of said piston, one sideof said chamber being constituted by one of said rolls and means forholding the piston against the roll and supplying fluid to said chamberthrough said passage.

6. In a mill, the combination of a pair of coacting rolls, journals forsaid rolls, fluid means for reinforcing said rolls intermediate thejournals, and means for holding said rolls positively spaced.

7. In a mill, the combination of a air of coacting rolls, journals forsaid rol and floating means above and below the roll pass for creatinga'fluid pressure directly on both of said rolls intermediate thejournals.

8. In a mill, the combination of a pair of coacting rolls, journals forsaid rolls, a cylinder, a diflerential area fluid piston in saidcylinder for reinforcing one of said rolls, said piston having a chamberadjacent the roll connected to the interior of said cylin-' der, andmeans for creating a fluid pressure directly on said roll.

9. In a mill, the combination of a roll, a ylinder, a piston in saidcylinder engaging said roll and having a chamber therein adjacent theroll, said cylinder and said chamber being interconnected, and means forsupplying fluid under pressure for holdin the piston against the rolland creating flui pressure directly upon the roll to reinforce and coolthe roll.

10. In a mill, the combination with one of the rolls of the mill, of acylinder, a pisto-n therein having a chamber, one side of which isconstituted by the roll, means connecting said chamber to the interiorof said cylinder, the areas of said piston and chamber being such thatthe resultant hydraulic pressure acts to operatively seal the chamberagainst the roll whereby the liquid in thiel chamber supports and.reinforces the r0 11. In a mill, the combination with one portioned thatthe liquid in the cylinder acts of the rolls of the mill, of a cylinder,a pisto operatively seal the chamber against'the ton therein having achamber, one side of roll and the liquid in the chamber acts to which isconstituted by the roll, means for cool, support and reinforce the roll.

5 supplying liquid under pressure to the cylin- In testlmony whereof Ihave hereunto set der and the chamber in the-piston, the areas my hand.of the piston and the chamber being so pro- FLORENCE C. BIGGERT, JR.

